The 6-spike plate and internal shank are engineered to provide the rigidity you need in a short distance women’s spike shoe, while REVlite in the midsole and rubber outsole deliver comfort and protection that won’t slow you down.6 spike Pebax® plate offers a high-strength thermoplastic polymer outsole with great flexibility and impact resistant properties for long lasting durabilityIdeal for 50m to 400mInternal shankSleek molded midsoleStandard spike size is 1/4 inchWrapped rubber outsole